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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76eef93daf287de4df5a0564d5e8fa9c98e115c1c21fd74ed1ce075a9630e411' 
  AND token = 'mcoCKIF7UzMe7Njl3ju7jTDBA6BI5EuS1OIJkV62Cco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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