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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4033a704fd34f767783c24f18062f6c7618db1a546a0cf1b1efe8829422bcf7' 
  AND token = 'lIf9QULkie0IT5aN/K4UadFK5NSW3DKU0VdhzJXPr4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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