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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fadd8b9e3a4e37ca3ca3c5bfc3137e136a3d9206f476c3a0c95e3a70df209b' 
  AND token = 'q2eYJY8O23nluy6GrU4bb2XQtssqKVqHQf1M7VTAKRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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