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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca2f7bc5410955465aa0e47b27b24a70df02bc9d7d535f8736bd1299a4abf6c' 
  AND token = '0gfs1DDWUJI8Y7DzRbF0VYeBkOUufupWSmfYoS3+7UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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