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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60f3574464b77636b549623c883a9a93c4f95bf60a39e63397e8770dc8a5fe0' 
  AND token = 'cpAaVB957a2KJxHy7JSaGumN+ln8k10oLP73+qZdqpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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