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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11c21b27df8d623ca5c9e1f766d168c122935e7eebc4d48e3a2c62a81df4bf8' 
  AND token = 'n3MiTWXA22P7ZTSU1ElFpZ1gdx8pklva//lH7EVwC5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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