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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd61d514cca2e840d2054cdeff46156255970347512009f04f722138ec1d9721' 
  AND token = 'hsy1ccXWBQPGN+l/8uNdNWJAv9TwZx4+rrNVHDKFYDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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