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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1334840f2127118a2e82cc336ed75312c1537e6725e3422412b4f5de408dd9ba' 
  AND token = 'xE54JOafERw0Ny3kHKzSm3NIL6nzP9X0AEf3IpT0mLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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