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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0e809e2643aa798587782528b833066311c3ec0e9a499fe919ddb7ac89c5eb' 
  AND token = '/2omcHbguNXI93lNWHz9rFgximzci5i/lVS0lJjyf3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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