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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9596f26c5ace11fa6ef7cd11d8ed6ba32d6dfe4665386ea25dc9f76b55f05093' 
  AND token = 'ZxL5EPRzFI5g4ToTjBGDi6KIJEpyRNP0Zts6uT5Rcvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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