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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57464d409589c948bc8e934370c3c208294d9cbc286f8f649f9847d4f3c8be8' 
  AND token = '3YdgXss0GDclH0kTdkBZd3kri78ncV7dt/zs+oLea2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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