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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa71619488a9e116fffe5d131f3b8188127e525237a2c741f40a1dfd1a12fec6' 
  AND token = '57fuZ8E6jXOiDSdkY40lFRFn45NJsFduey9/30wEvXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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