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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a024bc2bc450e9a73f64b49507cdd7ae3aad7fa75fc81f99e1aa0b7a72716ab9' 
  AND token = '/yKM5AFU9A8eC12mQSIV046/RSJqTSfkKebh7JiukmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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