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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234f0029d1f97930aec4667698d0a12e315159a6e4254de7a0825a5fba82cfd4' 
  AND token = '0zZhiaTs9p13M5QxsnfPWKN+jTmom9H43YovtLRzP+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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