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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feffa626db9dd6d538c5a5d36eaeea636a14e6c573d262b8e6ba403df71a055d' 
  AND token = 'MtYi5hEaPX0zJyDxlX/JiWGkYNGRRvRqsUN/4bhva3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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