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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0992dd42a48746f0c5e010d276be8b95ab9ca4222f8ee0d80fc9629a2e7310a7' 
  AND token = '38Scfp/PFZKHOiAbhBiMOKAw+rvNIcycrsO/vVS0e8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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