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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7240586b0dc830d76b2698cc81942acb9ae7185c549cd88511c2bccd9b3dae' 
  AND token = 'CSq7h6zYvXxfPM+UkJAGleh6V64P+aqw68J9ziLFCXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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