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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce38f1f340da2615e0b821f0243aca7805c541c9fad1a1645aa057655dc16e9' 
  AND token = 'AuihxflrrAc6JcWeFm7jeUuHEWhoqPsNl1N1nF5PVrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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