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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f63903057b3c5dd3b7ff0d4a040704660ee63904d79da58b790b6c9805bd54a' 
  AND token = 'GhoYFsa+8kzflZnJ5O9rgz5fDLFJSKPzQZ8+NRQWQFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}