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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76313812b684f714d5a06eb3917c3d4c0b618eec7befaab2ee898b81b48fe71' 
  AND token = 'lhMidMf87n2lI3jwwlFOf2iZf7Ongbt1UAYLHCjPqkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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