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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa770e567b2b94325d55565db4bf6f4f0a513f8f9b42532f3033342a2616357a' 
  AND token = 'BSsKbfYPBjYncCXrKrjWG3oPQ9UimuwdhkdcC9mnYso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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