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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97ba5e458616fae66d03989cef2247d3c798d500dd2327dc47926b2945c430a' 
  AND token = '/uyv96bsg2t5hyR+ADpZmmE5ZKRljbfLfLqNnckfgoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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