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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a93bcec0e1e4a38e2ac9cef91c981cdc1fdea67f2830278e681553285b489f2' 
  AND token = 'GEM+Lb7FErmJ7eSVHNYq/hjqekcWpJRWqA3l2E7Ihus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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