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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f26ccc92171f47e3c339c34e96c9e7100b62b01a1468de80cacaec02ca794d0' 
  AND token = 'I4V8rn5nlucN5VyHLlSmSWf/PfT+iOpefUrTCvmAHUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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