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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa75409fc88daa20df9fe1f9225b38178bca3564b36b510d7b857b779633157' 
  AND token = 'sAALLdx9joQP7BYTYMJFeLNw40ScbUwQNlTKijJM6/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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