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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72819fe74181595a0f3a40c145c7f01fc2d76b19ae33c4f44900ef94e52a9a39' 
  AND token = 'fmYObNKfVG2xEw5JHbOAqZ322fAXZ+9IiX44w3hYwRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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