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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa674fa6656af5a36ab2468565e23815f1a2568ce7512dbf7863407f15414cf' 
  AND token = 'utoUpFoDzVko/MRE+0bEvoNpSqkNcv3jC/MzjD23GXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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