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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac3b91d5ad69bd5e0412f1ed433cdf128377a172e02e27242c9e6577639c078' 
  AND token = 'kn1wgawCjEM9XIqT1agm6pb3slcr6x1Waz/nf/7OQt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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