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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60f42880585dcb2cea6e11f69d37d3ba6f353a6fc2ea495d58b376865d5d1e9' 
  AND token = '1iDKaIuwYCl1NhK0u95NgJyTjKqCuSicbLkBAfeFD4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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