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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a1ea0ae2a91ebe0b5959d291b1f82e051d66d737891c56fd9830cb783b5bfa' 
  AND token = 'iTQ/0H4BVRiBOBZtkxD7D7Rz59z//HJg4Qu4ePew1EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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