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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba39323a2c977ca919ba2baa2aab10fefe0536075cf42f5d8494bb5eddcee7fe' 
  AND token = 'v6/VBqlaICzSvMil3lvjhoIWct3elVhhXde0xDe1AWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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