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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b629b14ce68c4677a08d2cc964050afff2fa72e6c903b25e78ca8c1332c27aa' 
  AND token = 'CITkFs/SeRAkjTV9vZglwZQROIPBRZIjmtTI8k2fq8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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