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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb37e8cde9386ba67d63c0a7c041d583f9fd7d223cb3097c4fa39cafb84d61a' 
  AND token = 'zpaCGJjAYetlq+H9ouZ93XIqYkIw8PyKE6KBXDKX9nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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