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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588b2570166671d1c9d784d952bfc71647dc469e5367fc8452f93a9de7817337' 
  AND token = 'PqcNPt8ec/GKa5ImIi7dLnecYu8fcQrjwff+S5FODyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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