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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0da3c0f90f7f3253700ca3e66401bf7c458a73f41402ee964550778a63071e5' 
  AND token = 'NhSKDq1RQg2PXpDYt9iViD/x7d0Eq0lAx0BbEiq/c5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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