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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c734ad38d8a4e0f8c23928c672a92681ff98dd3d543d5a46035fe746ab1502eb' 
  AND token = 'GFKsqlAGWuTV2dmzGH7qA26L7DEDPKQM7LkJteyNz4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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