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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b72fa3cfa48dea5f491a13a74b651bedb11695de570118c5b7ebd771288ba23' 
  AND token = 'vhOtl0oM4IOjU20w83/YRfobOPjszB2Gz1tI28Eewg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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