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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f010d9ef626ef5f086db95c65b3bbf65c4c77fc99838eab9ed26c166772c9e95' 
  AND token = 'z3yz6k/xF8NP+kK9Y3EV5s3M8ddYELIusm9vz741gFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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