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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104c917b00607a00f388f3f987ba6f8c9403604cc44c70855914605793dd9e5d' 
  AND token = 'goQZiq7SGTrQj9HjtBySVhimq5Tq4ItVcccEl7rzkZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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