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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e313c0754708f53e3c3467e92410a14ff4f18364fa478cc1840fb70d57a8e288' 
  AND token = 'cdhQfAOjvUw+jRaj3X5ki+ioA4K7+UkLFCLQHlmHJ4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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