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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dedc1f199f87771e76496bf7196af4333f502c2bc9e0084f00863a5b996486' 
  AND token = 'SNr7MpMJkHk/1rc4jo4Y7WImLhK6VyGBAhipK51y2pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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