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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5ad0daa7e26fa495e89d76b6cc01806cdd130f55c60d1657962981f7e3a97c' 
  AND token = 'z8C5E3/chQ703e9hoZd5bbCmf823iAh0bU0h0gddtzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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