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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6788618eb371f8bc429e06ec499c79ecd924afe43196bec90ac295c90068e9e' 
  AND token = '1B3Kb1P4M+n1ksFd+xUydAOBFrXypbNdPCJDF92nIes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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