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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347a6dd76fafe2e1e496c1a5a2e3c8e0a211100ad6acc1c71c44e5e0bf7895c4' 
  AND token = 'OrbXKY/khLpLLDaR+qz6L9rlYZxFhh8vIYl+ZvMGrSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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