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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb72432a30e4d7c059cd8e215b701370a5fd689671c4d13a35bd7a77fdaf3c5' 
  AND token = '/TILaulxpNG0zLlGvOOny7owhNfPmrX8wtxQ5qrF30Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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