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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10776ac3e57dc8c4f508f3e3a72e192dff2a47b8e4e5b76760ea17e68f431ea0' 
  AND token = 'XKdnfC5bCGHjkcGNpGzECAEitFi8rCXmZcDR8KD7sPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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