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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98ed0e9ac59e7623c3c7f6ddeab2f4e54311f7ee5a902c96df38db9a12d61b4' 
  AND token = 'p8L6fRjLxd5Z7YUPOGV114oCTF1/p7zENff+O9P089c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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