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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc15e9a4c59645973f5709c11639f8d478174433517722a8f5647a57990c0955' 
  AND token = 'jZ4jdc4z7z9KKl6wh6rZ0EBjMU0CW6Emzi5y1i9pF1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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