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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b44777442de2e41b0f8a3c9d3ea60c4816e8db41c45570fb6732c7a5271534' 
  AND token = 'SIrIbfFWVRB6QqJDd93KTyW6H/oPk5LzdNFfsuJBq4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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