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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593c4576246e9a74f3a70751aaad0e57b23cdc920ea7041011db1194104ff7bc' 
  AND token = 'CsAnNL1y0ZsHxjebZix5zcRm4LqvGrE24LKF8mZ1klE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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