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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2ffcb3e26db961c91d71fb4fa37e403dde894f7e9b66555e23c12c12c6d1ed' 
  AND token = 'D364VHjkuur4MW3ILRersLC/d9b1HOFMikG2OMEKklU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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