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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f9f519f632aeade8cbb623b9f31e3d01fb15fb24962cca94a54c04549e360a' 
  AND token = 's1+4hT5uSlMeMctDm4u/1L53NpmjKUdQS3OysLuyf78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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