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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec813726bf0533b350d5dfd6544347fb12b1ea74be0ecab5cb672f8f891e124' 
  AND token = 'LBrQM60C4L2k2bQWj8zpvmTmv2esPKIuCg6vSPE2cnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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